Nanostructured CuO Thin Films Prepared through Sputtering for Solar Selective Absorbers

Table 1

Photo-thermal performance of different CuO thin films prepared though DC reactive magnetron sputtering.

Sample	Substrate temp. (°C)	O2 to Ar ratio	Absorptance (𝛼)	Emittance (𝜀)	Selectivity (𝛼/𝜀)
A	30	1 : 1	0.71	0.07	10.1
B	30	1 : 2	0.66	0.09	7.3
C	300	1 : 1	0.57	0.10	5.7
D	300	1 : 2	0.56	0.09	6.2